Marker selection for <Emphasis Type="Italic">Fusarium</Emphasis> head blight resistance based on quantitative trait loci (QTL) from two European sources compared to phenotypic selection in winter wheat |
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Authors: | T Miedaner F Wilde V Korzun E Ebmeyer M Schmolke L Hartl C C Schön |
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Institution: | 1.State Plant Breeding Institute,Universit?t Hohenheim (720),Stuttgart,Germany;2.KWS LOCHOW GMBH,Bergen,Germany;3.Chair of Plant Breeding,Technische Universit?t München,Freising,Germany;4.Bavarian State Research Center for Agriculture, Institute for Crop Science and Plant Breeding,Freising,Germany |
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Abstract: | Fusarium head blight (FHB) infects all cereals including maize and is considered a major wheat disease, causing yield losses and mycotoxin
contamination. This study aimed to compare the realized selection gain from marker and phenotypic selection in European winter
wheat. A double cross (DC) combined three FHB resistance donor-QTL alleles (Qfhs.lfl-6AL and Qfhs.lfl-7BS from ‘Dream’, and one QTL on chromosome 2BL from ‘G16-92’) with two high yielding, susceptible winter wheats, ‘Brando’ and
‘LP235.1’. The base population of 600 DC derived F1 lines was on one hand selected for the respective QTLs by SSR markers (marker-selected cycle, CM), resulting in 35 progeny
possessing different combinations of beneficial donor-QTL alleles. On the other hand it was selected phenotypically, only
by FHB rating, and the best 20 lines were recombined and selfed (phenotypically selected cycle, CP). The variants CP, CM,
and an unselected variant (C0) were tested at four locations by inoculation of Fusarium culmorum. Resistance was measured as the mean of multiple FHB ratings (0–100%). FHB severity was reduced through both phenotypic and
marker selection by 6.2 vs. 5.0%, respectively. On a per-year basis, marker selection by 2.5% was slightly superior to phenotypic
selection with 2.1%, because the first variant saved 1 year. Marker-selected lines were on average 8.6 cm taller than phenotypically
selected lines. A high genetic variation within the marker-selected variant for FHB resistance and the high effect of a resistance-QTL
allele on straw length indicate that additional phenotypic selection will further enhance selection gain. |
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Keywords: | Fusarium culmorum Triticum aestivum Deoxynivalenol Marker QTL Resistance Plant height |
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